diff --git a/package-lock.json b/package-lock.json
index b7eaa48f3..2f3915e4f 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12704,6 +12704,14 @@
         }
       }
     },
+    "cross-env": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/cross-env/-/cross-env-7.0.3.tgz",
+      "integrity": "sha512-+/HKd6EgcQCJGh2PSjZuUitQBQynKor4wrFbRg4DtAgS1aWO+gU52xpH7M9ScGgXSYmAVS9bIJ8EzuaGw0oNAw==",
+      "requires": {
+        "cross-spawn": "^7.0.1"
+      }
+    },
     "cross-spawn": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/cross-spawn/-/cross-spawn-7.0.3.tgz",
diff --git a/package.json b/package.json
index 61f5f155a..7e0e95277 100644
--- a/package.json
+++ b/package.json
@@ -72,6 +72,7 @@
     "cordova-plugin-okhttp": "^2.0.0",
     "cordova-res": "^0.15.3",
     "cordova-sqlite-storage": "^5.1.0",
+    "cross-env": "^7.0.3",
     "crypto-js": "^4.0.0",
     "date-fns": "^2.17.0",
     "depd": "^2.0.0",
diff --git a/readme.md b/readme.md
index 06de9b543..b56034849 100644
--- a/readme.md
+++ b/readme.md
@@ -20,6 +20,9 @@ npm install -g cordova-res
 ## Mobile first dependencies
 cordova plugin add cordova-plugin-mfp-jsonstore
 cordova plugin add cordova-plugin-mfp
+
+## memory leak
+set NODE_OPTIONS=--max_old_space_size=10096
 ```
 
 ## Start the development server
diff --git a/tsconfig.json b/tsconfig.json
index ba1f0eb2d..faa2945bc 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,7 +10,8 @@
     "module": "es2020",
     "moduleResolution": "node",
     "importHelpers": true,
-    "target": "es5",
+    "target": "es2015",
+    // "target": "es5",
     "lib": [
       "es2018",
       "dom"